// Class create
class Lazyman {
  constructor(name) {
    this.task = [];
    const fn = () => {
      console.log(`Hi! This is ${name}`);
      this.next();
    }
    this.task.push(fn);
    setTimeout(() => {
      this.next();
    }, 0);
  }

  next() {
    const fn = this.task.shift();
    fn && fn();
  }

  sleepFirst(time) {
    const fn = () => {
      setTimeout(() => {
        console.log(`Wake up after ${time}`);
        this.next();
      }, time * 1000);
    }
    this.task.unshift(fn);
    return this;
  }

  sleep(time) {
    const fn = () => {
      setTimeout(() => {
        console.log(`Wake up after ${time}`);
        this.next();
      }, time * 1000);
    }
    this.task.push(fn);
    return this;
  }

  eat(type) {
    const fn = () => {
      console.log(`Eat ${type}~`);
      this.next()
    }
    this.task.push(fn);
    return this;
  }
}

// Run Lazyman
const lazyman = (name) => new Lazyman(name);


// Example
lazyman('hank').eat('dinner').sleep('3');